audio: Properly support external device port with static configs

External device ports might not have dynamic profiles, for example,
ports for BT devices. Properly handle this case in the default
implementation.

Bug: 264712385
Test: atest VtsHalAudioCoreTargetTest
Test: atest audiosystem_tests
Change-Id: I8d4bcbf6ccf2ba05436e68e3ba94567fc7610eb7